422 Stainless Steel

General Properties

With better strength at higher temperatures, Type 422 (S42200) is an appealing alternative to Type 403.  Type 422 is a hardenable martensitic stainless steel which is being widely used for high temperatures up to 1200°F. It is capable of being heat treated to various high strength levels. It is often used in aircraft and power industries who require high strength/weight ratios from room temperature to 1200°F.

 Applications:

• Aircraft parts
• Steam and gas turbine components
• High heat components
• Rotors

Standards:

• UNS: ASTM/ASTE 42200
• DIN: 1.4935

Corrosion Resistance:

• Adaptable to applications where maximum resistance to corrosion is not required.
• Resistant to the corrosive action of the atmosphere, fresh water, steam, and a variety of the milder acids and alkalies.

Oxidation Resistance:

• Good resistance to destructive scaling or oxidation
• Continuous service at temperatures up to 1250F.
• Temperature will vary with the type of atmosphere, type of construction, and cycle of operation.

Machineability

• Comparable to 18-8 but easier to machine
• Help avoid galling with sharply ground tools
• Maintain consistent speed and feed
• Turning tools: 8-14° side rake
• Drilling: 140° point
• Threading: grind tools with 10-15° back rake
• Cobalt high-speed tools: turn at 90-120 sfpm, drill at 40-75 sfpm, mill at 70-120 sfpm, ream at 20-60 sfpm, roughing and finishing at 200-400 sfpm

Workability

• Initial forging and rolling at 2100° to 2150°F (1149° to 1177°C)
• 1700°F (927°C) minimum to hot work

Chemical Properties:

Mechanical Properties:

Physical Properties:

Physical Properties for Stainless Steel type 422 will be available shortly